A solution containing a mixture of metal cations was treated as follows. 1. Dilute HCl was added and a precipitate formed. The precipitate was filtered off. 2. H,S was bubbled through the acidic solution. Again, a precipitate formed and was filtered off. 3. The pH was raised to about 9 and H,S was again bubbled through the solution. No precipitate formed. 4. Finally, sodium carbonate was added and no precipitate formed. What can be said about the presence of each of these groups of cations in the original solution? Cation Group Description Present in the original solution? Ag*, Pb²+, Hg²+ form insoluble chlorides Bi3+, Cd²+, Cu²+, Hg²+, Pb2+, Sb³+, Sn²+, Snª+ form acid-insoluble sulfides Al3+, Co²+, Cr³+, Fe²+, form base-insoluble sulfides or hydroxides Fe3+, Ni2+, Mn²+, Zn²+ Ba?+, Ca?+, Mg²+, Sr²+ form insoluble carbonates

A solution containing a mixture of metal cations was treated as follows. 1. Dilute HCl was added and a precipitate formed. The precipitate was filtered off. 2. H,S was bubbled through the acidic solution. Again, a precipitate formed and was filtered off. 3. The pH was raised to about 9 and H,S was again bubbled through the solution. No precipitate formed. 4. Finally, sodium carbonate was added and no precipitate formed. What can be said about the presence of each of these groups of cations in the original solution? Cation Group Description Present in the original solution? Ag*, Pb²+, Hg²+ form insoluble chlorides Bi3+, Cd²+, Cu²+, Hg²+, Pb2+, Sb³+, Sn²+, Snª+ form acid-insoluble sulfides Al3+, Co²+, Cr³+, Fe²+, form base-insoluble sulfides or hydroxides Fe3+, Ni2+, Mn²+, Zn²+ Ba?+, Ca?+, Mg²+, Sr²+ form insoluble carbonates

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter17: Complexation And Precipitation Reactions And Titrations

Section: Chapter Questions

Problem 17.35QAP

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